Error while compiling telerik silverlight project for RadGanttView

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Visual-Studio

Telerik

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I recently upgraded to Silverlight 5 and was created silverlight project through

RadControls Silverlight Application template in VS2010 and I have selcete RadGanttView

control from the RadCOntrols list ,and tried to compile and run.

Then I started getting

Cannot resolve reference assemblies. Please check the reference assemblies. Could not load

file or assembly 'System.Core, Version=5.0.5.0, .... or one of its dependencies. The

system cannot find the file specified.

The dlls are the latest for Silverlight 5 and installed in a right directory.

If I add normal silverlight application in VS2010,It works fine(Without following

References:Telerik.Windows.Controls,Telerik.Windows.Controls.GanttView,Telerik.Windows.Scheduling.Core)

Note: I have Installed Telerik 2013 Q3 Release

How do I resolve this ?